Question

(x – 2y - z)²
expand the following​

Answer 1

${(x - 2y - z)}^{2} \\ \\ {(x)}^{2} + {( - 2y)}^{2} + {( - z)}^{2} + 2[(x)( - 2y) + ( - 2y)( - z) + ( - z)(x)] \\ \\ {x}^{2} + {4y}^{2} + {z}^{2} + 2[( - 2xy) + (2yz) + ( - xz)] \\ \\ {x}^{2} + {4y}^{2} + {z}^{2} - 4xy + 4yz - 2xz$